Air purifier



FIG. 1 is a front, top and right side perspective view of an air purifier in accordance with my invention thereof;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left elevation view thereof;

FIG. 5 is a right elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view of an air purifier.

The broken lines depict portions of the air purifier that form no part of the claimed design. 

The ornamental design for an air purifier, as shown and described. 